It seems like everywhere a person goes there is at least one person with a cell phone to his ear. Even in places 21 cell phone usage is banned such as concert halls or movie theatres there is the 22 offender, or at least a few people using the text messaging feature 23 their phones.
Cell phone usage has 24 over the past decade and continues to rise. Nearly 200 25 people in the United States have cell phones and there are 26 over one billion users worldwide. That means there are a lot of phones 27 their frequencies over the airwaves at any given time.
Concern has arisen over whether or not cell phone usage 28 harm a person’s health. Brain cancer rates in the United States have risen since call phones were 29 , leading some people to wonder if cell phone usage is the reason for the 30 .
Some people say the biggest danger 31 cell phones isn’t from the either real or perceived potential to develop cancer, but from 32 while using the cell phone. How many of us have seen vehicles driving 33 erratically(不稳定地) down the road. And we often see when we get near the vehicle the driver on a cell phone is 34 on a cell phone. It is a proven fact that a driver on a cell phone is 35 attentive and more likely to get in an accident. And, hands-free sets aren’t the 36 that some people may believe. Yes, they 37 both hands for driving and prevent a person from getting a sore(酸疼的) arm, 38 the driver’s mind is still 39 the conversation and therefore less attentive to what is 40 around him or her on the road.
21. A. which B. where C. there D. here
22. A. busy B. always C. occasional D. occasionally
23. A. under B. on C. from D. to
24. A. been exploded B. exploded C. been exploding D. exploding
25. A. millions B. millions of C. million D. million of
26. A. well B. good C. better D. best
27. A. delivering B. carrying C. taking D. sending
28. A. may B. must C. can D. should
29. A. allowed B. invented C. introduced D. bought
30. A. increase B. decline C. improvement D. rose
31. A. with B. before C. in D. on
32. A. attention B. attractive C. careless D. inattentiveness
33. A. quite B. almost C. hardly D. nearly
34. A. using B. talking C. moving D. handing
35. A. more B. less C. least D. fewer
36. A. problem B. question C. mean D. answer
37. A. hold up B. pick up C. put up D. free up
38. A. therefore B. as C. but D. though
39. A. taken up B. filled by C. occupied with D. picked up
40. A. happening to B. going on C. talking about D. moving about